I am using VT1005 and Huwei modem for BSNL connection in India. When I unplug the internet cable from the desktop and plugs it into my laptop it says Limited / no connectivity. I did power cycle etc created new PPPOE settings but it is not helping me. Any clues? It is working fine with my desktop.

Is the NIC in the PC having problems a Realtek? Make sure you have the most up to date drivers. There are known issues with certain Realtek NIC's that cause the problem your having. Make sure that there is a Link LED lit on the PC's NIC as well as on the VT1005's LAN port when you have them cabled together. Make sure the PC's NIC is set to auto negotiate. If it is, try to set it to 10Mbps/Full Duplex and if it still does not connect, set it to 10Mbps/ Half Duplex.

Lastly you may have to setup a static IP address instead of using DHCP.